CONTENTS 



Introduction, 



Symptoms, .... 

 Description of the causal fungus. 

 Mycelium, 

 Sclerotia, 

 Conidiophores, 

 Conidia, .... 

 Life history of the fungus. 



Germination of the spores, 

 Temperature relations, 

 Effect of freezing the spores. 

 Thermal death point of spores, . 

 Effect of desiccation on the spores, 

 Parasitic life of the fungus, 



Pathogenicity, .... 

 Infection court. 



The mycelium in the host tissues. 

 Normal structure of the stem, 

 Path of the mycelium. 

 Effect on the host cells. 

 Saprophytic life of the fungus, . 



Longevity of mycelium in the soil. 

 Growth on other substrata. 

 Depth of penetration of the soil, . 

 Rate of growth of the mycelium. 

 Effect of freezing the mycelium, . 

 Thermal death point of mycelium. 

 Dissemination, ..... 

 Original source of the pathogene. 

 Spread from one grower to another, . 

 Local dissemination. 

 Occurrence of two species of Cylindrocladium on roses. 

 Morphological characters. 

 Cultural characters, 



Latin description of Cylindrocladium panum. 

 Control, .... 



Exclusion of the pathogene, 

 Eradication of the pathogene. 



Disinfection by chemicals. Laboratory tests. 

 Formaldehyde, . 

 Sulfuric acid. 

 Copper sulfate, . 

 Lime-sulfur, 

 Dry sulfur. 



Soot, .... 



Greenhouse tests with formaldehyde. 

 Disinfection by heat. Laboratory tests. 



Time required to disinfect soil by steaming. 

 Green house tests of disinfection by heat. 

 Disinfection of pots, tools, etc., . 

 Protection of the host, . . . . 



Comparative value of different fungicidal 

 Lime-sulfur, .... 



Dry sulfur flour, 

 Ammoniacal copper carbonate. 

 Lime, ..... 



Bordeaux mixture, . 

 Treatment of the walks in the house, . 

 Immunization of the host, 

 Summary of control measures, . 

 Literature cited, ..... 



Publication of this Document approved by the Supervisor of Administration. 



